Move copilot-setup-steps.yml to workflows directory for proper execution

[Copilot]

Problem

The setup steps defined in .github/copilot-setup-steps.yml were not being executed because the file was located in the wrong directory. GitHub Actions workflows must be placed in the .github/workflows/ directory to be recognized and executed by the GitHub Actions runner.

This caused issues when trying to verify the setup process, as running python -c 'import pytensor' would fail with:

ModuleNotFoundError: No module named 'numpy'

Solution

Moved the workflow file from .github/copilot-setup-steps.yml to .github/workflows/copilot-setup-steps.yml.

What This Enables

With the file in the correct location, the workflow will now:

1. Be properly recognized by GitHub Actions
2. Automatically trigger when:
   • Manually invoked via workflow_dispatch
   • The workflow file itself is modified (via push or pull request)
3. Execute the setup steps that:
   • Install Python 3.13 with Micromamba
   • Install all required dependencies (numpy, scipy, jax, etc.)
   • Install pytensor in development mode
   • Verify the installation by importing pytensor

This ensures that the Copilot agent environment is properly configured with all necessary dependencies before code execution.

Original prompt

Please run the command python -c 'import pytensor' and show the output. I want to check if the setup steps in .github/copilot-setup-steps.yml are being executed correctly.

If the command fails, please also try to move the file .github/copilot-setup-steps.yml to .github/workflows/copilot-setup-steps.yml and run the import command again.

*This pull request was created as a result of the following prompt from Copilot chat.* > Please run the command `python -c 'import pytensor'` and show the output. I want to check if the setup steps in `.github/copilot-setup-steps.yml` are being executed correctly. > > If the command fails, please also try to move the file `.github/copilot-setup-steps.yml` to `.github/workflows/copilot-setup-steps.yml` and run the import command again.

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